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  <h4 id="写在前面"><a href="#写在前面" class="headerlink" title="写在前面"></a>写在前面</h4><p>在开发项目的时候，很多场景需要用到小图标，一般会采取以下做法：<br>1、雪碧图，缺点：将所有图标集中在一张雪碧图中，修改或新增图标需整张雪碧图替换，难为维护，开发要靠图标定位，开发效率低<br>2、png小图标： 缺点：模糊、失真，占用体积大<br>3、iconfont：需引入infont的css，如果修改图标需要整个css替换，同事，图标引用不具有语义化。<br>于是 svg 登场了……………….<br>svg的有点<br>*支持多色图标了，不再受单色限制。<br>*支持像字体那样通过font-size,color来调整样式。<br>*支持 ie9+<br>*可利用CSS实现动画。<br>*减少HTTP请求。<br>*矢量，缩放不失真<br>*可以很精细的控制SVG图标的每一部分</p>
<h4 id="封装一个全局组icon-svg组件"><a href="#封装一个全局组icon-svg组件" class="headerlink" title="封装一个全局组icon-svg组件"></a>封装一个全局组icon-svg组件</h4><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br></pre></td><td class="code"><pre><code class="hljs plaintext">&lt;template&gt;<br>    &lt;svg<br>        :class=&quot;svgClass&quot;<br>        aria-hidden=&quot;true&quot;<br>        v-on=&quot;$listeners&quot;<br>        :style=&quot;&#123;width: width, height: height&#125;&quot;<br>    &gt;<br>        &lt;use :href=&quot;iconName&quot; /&gt;<br>    &lt;/svg&gt;<br>&lt;/template&gt;<br><br>&lt;script&gt;<br>    export default &#123;<br>        name: &#x27;IconSvg&#x27;,<br>        props: &#123;<br>            iconClass: &#123;<br>                type: String,<br>                required: true<br>            &#125;,<br>            className: &#123;<br>                type: String,<br>                default: &#x27;&#x27;<br>            &#125;,<br>            width: &#123;<br>                type: String,<br>                default: &#x27;16px&#x27;<br>            &#125;,<br>            height: &#123;<br>                type: String,<br>                default: &#x27;16px&#x27;<br>            &#125;<br>        &#125;,<br>        computed: &#123;<br>            iconName() &#123;<br>                return `#icon-$&#123;this.iconClass&#125;`<br>            &#125;,<br>            svgClass() &#123;<br>                if (this.className) &#123;<br>                    return &#x27;svg-icon &#x27; + this.className<br>                &#125; else &#123;<br>                    return &#x27;svg-icon&#x27;<br>                &#125;<br>            &#125;,<br>            styleExternalIcon() &#123;<br>                return &#123;<br>                    mask: `url($&#123;this.iconClass&#125;) no-repeat 50% 50%`,<br>                    &#x27;-webkit-mask&#x27;: `url($&#123;this.iconClass&#125;) no-repeat 50% 50%`<br>                &#125;<br>            &#125;<br>        &#125;<br>    &#125;<br>&lt;/script&gt;<br><br>&lt;style scoped&gt;<br>    .svg-icon &#123;<br>        width: 1em;<br>        height: 1em;<br>        vertical-align: -0.15em;<br>        fill: currentColor;<br>        overflow: hidden;<br>    &#125;<br><br>    .svg-external-icon &#123;<br>        background-color: currentColor;<br>        mask-size: cover!important;<br>        display: inline-block;<br>    &#125;<br>&lt;/style&gt;<br></code></pre></td></tr></table></figure>

<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><code class="hljs $xslt">//引入svg组件<br>import IconSvg from &#x27;@/components/IconSvg&#x27;<br><br>//全局注册icon-svg<br>Vue.component(&#x27;icon-svg&#x27;, IconSvg)<br><br>//在代码中使用<br>&lt;icon-svg icon-class=&quot;password&quot; /&gt;<br></code></pre></td></tr></table></figure>

<h5 id="引入所有的svg图标（使用svg-sprite）"><a href="#引入所有的svg图标（使用svg-sprite）" class="headerlink" title="引入所有的svg图标（使用svg-sprite）"></a>引入所有的svg图标（使用svg-sprite）</h5><p>制作 svg-sprite，要使用到 svg-sprite-loader 这个神器，它是一个 webpack loader ，可以将多个 svg 打包成 svg-sprite 。<br>如何在 vue-cli 的基础上进行改造，加入 svg-sprite-loader。先installsvg-sprite-loader，然后在vue.config.js中加入如下配置</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><code class="hljs plaintext">chainWebpack(config) &#123;<br>    // set svg-sprite-loader<br>    config.module<br>        .rule(&#x27;svg&#x27;)<br>        .exclude.add(resolve(&#x27;src/common/components/icon-svg&#x27;))<br>        .end()<br>    config.module<br>        .rule(&#x27;icons&#x27;)<br>        .test(/\.svg$/)<br>        .include.add(resolve(&#x27;src/common/components/icon-svg&#x27;))<br>        .end()<br>        .use(&#x27;svg-sprite-loader&#x27;)<br>        .loader(&#x27;svg-sprite-loader&#x27;)<br>        .options(&#123;<br>          symbolId: &#x27;icon-[name]&#x27;<br>        &#125;)<br>        .end()<br><br>    // set preserveWhitespace<br>    config.module<br>        .rule(&#x27;vue&#x27;)<br>        .use(&#x27;vue-loader&#x27;)<br>        .loader(&#x27;vue-loader&#x27;)<br>        .tap(options =&gt; &#123;<br>          options.compilerOptions.preserveWhitespace = true<br>          return options<br>        &#125;)<br>        .end()<br>  &#125;<br></code></pre></td></tr></table></figure>
<p>这样配置好了，只要引入svg之后填写类名就可以了</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><code class="hljs plaintext">import &#x27;@/src/icons/qq.svg; //引入图标<br><br>&lt;svg&gt;&lt;use xlink:href=&quot;#qq&quot; /&gt;&lt;/svg&gt;  //使用图标<br></code></pre></td></tr></table></figure>

<p>想到一个个import图标非常不优雅，且显得非常低级，所以要用到webpack 的 require.context。</p>
<ul>
<li>require.context(“./test”, false, /.test.js$/);这行代码就会去 test 文件夹（不包含子目录）下面的找所有文件名以 .test.js 结尾的文件能被 require 的文件。更直白的说就是 我们可以通过正则匹配引入相应的文件模块。</li>
</ul>
<p>然后我们就可以这样写来自动引入 @/src/icons 下面所有的图标了</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><code class="hljs plaintext">const requireAll = requireContext =&gt; requireContext.keys().map(requireContext)<br>const req = require.context(&#x27;./svg&#x27;, false, /\.svg$/)<br>requireAll(req)<br></code></pre></td></tr></table></figure>

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    <div class="pswp__scroll-wrap">

        <!-- Container that holds slides. 
            PhotoSwipe keeps only 3 of them in the DOM to save memory.
            Don't modify these 3 pswp__item elements, data is added later on. -->
        <div class="pswp__container">
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
        </div>

        <!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
        <div class="pswp__ui pswp__ui--hidden">

            <div class="pswp__top-bar">

                <!--  Controls are self-explanatory. Order can be changed. -->

                <div class="pswp__counter"></div>

                <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>

                <button class="pswp__button pswp__button--share" style="display:none" title="Share"></button>

                <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>

                <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>

                <!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
                <!-- element will get class pswp__preloader--active when preloader is running -->
                <div class="pswp__preloader">
                    <div class="pswp__preloader__icn">
                        <div class="pswp__preloader__cut">
                            <div class="pswp__preloader__donut"></div>
                        </div>
                    </div>
                </div>
            </div>

            <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                <div class="pswp__share-tooltip"></div>
            </div>

            <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
            </button>

            <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
            </button>

            <div class="pswp__caption">
                <div class="pswp__caption__center"></div>
            </div>

        </div>

    </div>

</div>

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe.min.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/default-skin/default-skin.min.css">
<script src="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe-ui-default.min.js"></script>

<script>
    function viewer_init() {
        let pswpElement = document.querySelectorAll('.pswp')[0];
        let $imgArr = document.querySelectorAll(('.article-entry img:not(.reward-img)'))

        $imgArr.forEach(($em, i) => {
            $em.onclick = () => {
                // slider展开状态
                // todo: 这样不好，后面改成状态
                if (document.querySelector('.left-col.show')) return
                let items = []
                $imgArr.forEach(($em2, i2) => {
                    let img = $em2.getAttribute('data-idx', i2)
                    let src = $em2.getAttribute('data-target') || $em2.getAttribute('src')
                    let title = $em2.getAttribute('alt')
                    // 获得原图尺寸
                    const image = new Image()
                    image.src = src
                    items.push({
                        src: src,
                        w: image.width || $em2.width,
                        h: image.height || $em2.height,
                        title: title
                    })
                })
                var gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, {
                    index: parseInt(i)
                });
                gallery.init()
            }
        })
    }
    viewer_init()
</script> 
<!-- MathJax -->

<!-- Katex -->

<!-- busuanzi  -->
 
<script src="/js/busuanzi-2.3.pure.min.js"></script>
 
<!-- ClickLove -->
 
<script src="/js/clickLove.js"></script>
 
<!-- ClickBoom1 -->

<!-- ClickBoom2 -->

<!-- CodeCopy -->
 
<link rel="stylesheet" href="/css/clipboard.css">
 <script src="https://cdn.jsdelivr.net/npm/clipboard@2/dist/clipboard.min.js"></script>
<script>
  function wait(callback, seconds) {
    var timelag = null;
    timelag = window.setTimeout(callback, seconds);
  }
  !function (e, t, a) {
    var initCopyCode = function(){
      var copyHtml = '';
      copyHtml += '<button class="btn-copy" data-clipboard-snippet="">';
      copyHtml += '<i class="ri-file-copy-2-line"></i><span>COPY</span>';
      copyHtml += '</button>';
      $(".highlight .code pre").before(copyHtml);
      $(".article pre code").before(copyHtml);
      var clipboard = new ClipboardJS('.btn-copy', {
        target: function(trigger) {
          return trigger.nextElementSibling;
        }
      });
      clipboard.on('success', function(e) {
        let $btn = $(e.trigger);
        $btn.addClass('copied');
        let $icon = $($btn.find('i'));
        $icon.removeClass('ri-file-copy-2-line');
        $icon.addClass('ri-checkbox-circle-line');
        let $span = $($btn.find('span'));
        $span[0].innerText = 'COPIED';
        
        wait(function () { // 等待两秒钟后恢复
          $icon.removeClass('ri-checkbox-circle-line');
          $icon.addClass('ri-file-copy-2-line');
          $span[0].innerText = 'COPY';
        }, 2000);
      });
      clipboard.on('error', function(e) {
        e.clearSelection();
        let $btn = $(e.trigger);
        $btn.addClass('copy-failed');
        let $icon = $($btn.find('i'));
        $icon.removeClass('ri-file-copy-2-line');
        $icon.addClass('ri-time-line');
        let $span = $($btn.find('span'));
        $span[0].innerText = 'COPY FAILED';
        
        wait(function () { // 等待两秒钟后恢复
          $icon.removeClass('ri-time-line');
          $icon.addClass('ri-file-copy-2-line');
          $span[0].innerText = 'COPY';
        }, 2000);
      });
    }
    initCopyCode();
  }(window, document);
</script>
 
<!-- CanvasBackground -->
 
<script src="/js/dz.js"></script>
 
<script>
  if (window.mermaid) {
    mermaid.initialize({ theme: "forest" });
  }
</script>


    
    

  </div>
</body>

</html>